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<Title>Step Line Chart</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Step Line Chart</p>
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<img src="images/stepline.png" width='600' height='300'>
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This example demonstrates joining data points with steps. It also demonstrates irregularly spaced data points on an auto-scaled true date/time axis.<br><br>
The step line layer is created using <a href="XYChart.addStepLineLayer.htm">XYChart.addStepLineLayer</a>.<br><br>
Most of the sample charts in this document use enumerated x-axes. In this axis type, the data points are assumed to be evenly spread on the x-direction, so it is not necessary to supply the x values of the data points. The x-axis is treated as a series of text labels using <a href="Axis.setLabels.htm">Axis.setLabels</a> or <a href="Axis.setLabels2.htm">Axis.setLabels2</a>. The labels can be dates/times, numbers, names, or any arbitrary text in any format. Enumerated x-axis is an easy to use yet extremely flexible axis type that is suitable for most charts.<br><br>
However, for charts with data points not regularly spaced, it is necessary to supply the x values of the data points using <a href="Layer.setXData.htm">Layer.setXData</a>. In this case, ChartDirector can automatically determine the type and scale on the x-axis (auto-scaling).<br><br>
For date/time axis, in many cases one may need to control the date/time label format. This can be done using <a href="Axis.setDateScale3.htm">Axis.setDateScale3</a>.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/stepline.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the chart
double[] dataY0 = {4, 4.5, 5, 5.25, 5.75, 5.25, 5, 4.5, 4, 3, 2.5, 2.5};
Date[] dataX0 = {new GregorianCalendar(1997, 0, 1).getTime(), new GregorianCalendar(1998, 5, 25
    ).getTime(), new GregorianCalendar(1999, 8, 6).getTime(), new GregorianCalendar(2000, 1, 6
    ).getTime(), new GregorianCalendar(2000, 8, 21).getTime(), new GregorianCalendar(2001, 2, 4
    ).getTime(), new GregorianCalendar(2001, 5, 8).getTime(), new GregorianCalendar(2002, 1, 4
    ).getTime(), new GregorianCalendar(2002, 4, 19).getTime(), new GregorianCalendar(2002, 7, 16
    ).getTime(), new GregorianCalendar(2002, 11, 1).getTime(), new GregorianCalendar(2003, 0, 1
    ).getTime()};

double[] dataY1 = {7, 6.5, 6, 5, 6.5, 7, 6, 5.5, 5, 4, 3.5, 3.5};
Date[] dataX1 = {new GregorianCalendar(1997, 0, 1).getTime(), new GregorianCalendar(1997, 6, 1
    ).getTime(), new GregorianCalendar(1997, 11, 1).getTime(), new GregorianCalendar(1999, 0, 15
    ).getTime(), new GregorianCalendar(1999, 5, 9).getTime(), new GregorianCalendar(2000, 2, 3
    ).getTime(), new GregorianCalendar(2000, 7, 13).getTime(), new GregorianCalendar(2001, 4, 5
    ).getTime(), new GregorianCalendar(2001, 8, 16).getTime(), new GregorianCalendar(2002, 2, 16
    ).getTime(), new GregorianCalendar(2002, 5, 1).getTime(), new GregorianCalendar(2003, 0, 1
    ).getTime()};

// Create a XYChart object of size 500 x 270 pixels, with a pale blue (e0e0ff) background, black
// border, 1 pixel 3D border effect and rounded corners
XYChart c = new XYChart(600, 300, 0xe0e0ff, 0x000000, 1);
c.setRoundedFrame();

// Set the plotarea at (55, 60) and of size 520 x 200 pixels, with white (ffffff) background. Set
// horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(50, 60, 525, 200, 0xffffff, -1, -1, 0xcccccc, 0xcccccc);

// Add a legend box at (55, 32) (top of the chart) with horizontal layout. Use 9pt Arial Bold font.
// Set the background and border color to Transparent.
c.addLegend(55, 32, false, "Arial Bold", 9).setBackground(Chart.Transparent);

// Add a title box to the chart using 15pt Times Bold Italic font. The text is white (ffffff) on a
// deep blue (000088) background, with soft lighting effect from the right side.
c.addTitle("Long Term Interest Rates", "Times New Roman Bold Italic", 15, 0xffffff).setBackground(
    0x000088, -1, Chart.softLighting(Chart.Right));

// Set the y axis label format to display a percentage sign
c.yAxis().setLabelFormat("{value}%");

// Add a red (ff0000) step line layer to the chart and set the line width to 2 pixels
StepLineLayer layer0 = c.addStepLineLayer(dataY0, 0xff0000, "Country AAA");
layer0.setXData(dataX0);
layer0.setLineWidth(2);

// Add a blue (0000ff) step line layer to the chart and set the line width to 2 pixels
StepLineLayer layer1 = c.addStepLineLayer(dataY1, 0x0000ff, "Country BBB");
layer1.setXData(dataX1);
layer1.setLineWidth(2);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "",
    "title='{dataSetName} change to {value}% on {x|mmm dd, yyyy}'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Step Line Chart&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Step Line Chart
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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